PUP.Optional.InstallCore.A

After running a MBAM I discovered the following 2 items:

Malwarebytes Anti-Malware 1.75.0.1300
www.malwarebytes.org

Database version: v2013.09.07.04

Windows 7 Service Pack 1 x64 NTFS (Safe Mode)
Internet Explorer 10.0.9200.16660
Mary :: MARY-PC [administrator]

9/7/2013 12:22:38 PM
mbam-log-2013-09-07 (12-22-38).txt

Scan type: Full scan (C:\|)
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 648591
Time elapsed: 3 hour(s), 1 minute(s), 23 second(s)

Memory Processes Detected: 0
(No malicious items detected)

Memory Modules Detected: 0
(No malicious items detected)

Registry Keys Detected: 1
HKCU\SOFTWARE\INSTALLCORE (PUP.Optional.InstallCore.A) -> No action taken.

Registry Values Detected: 1
HKCU\Software\InstallCore|tb (PUP.Optional.InstallCore.A) -> Data: 0C1S1J1B1H1I1NtG1WtHtC -> No action taken.

Registry Data Items Detected: 0
(No malicious items detected)

Folders Detected: 0
(No malicious items detected)

Files Detected: 0
(No malicious items detected)

(end)

Should I be concerned?